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MyInterpreter.cpp
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MyInterpreter.cpp
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// A SMING-compatible C interpreter
//
// This is a modified version of:
// A C interpreter for Arduino
// Copyright(c) 2012 Noriaki Mitsunaga. All rights reserved.
//
// This is a free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
// See file LICENSE.txt for further informations on licensing terms.
//
#include "MyInterpreter.h"
//////////////////////////////////////////////////////////////////////////////
// Global variables
//////////////////////////////////////////////////////////////////////////////
const struct ConstValue constants[] = {
{(char *)"LOW", 3, 0},
{(char *)"HIGH", 4, 1},
{(char *)"false", 5, 0},
{(char *)"true", 4, 1},
};
#define CONST_NUM (sizeof(constants)/sizeof(constants[0]))
#define FUNC2_NUM (sizeof(func2)/sizeof(func2[0]))
#define FUNC3_NUM (sizeof(func3)/sizeof(func3[0]))
MyInterpreter::MyInterpreter()
{
runAnimate = 0;
runDelay = 0;
runStep = 0;
reportProgPos = 0;
scriptBuf[0] = 0;
scriptLen = 0;
};
#ifdef USE_DELEGATES
void MyInterpreter::registerFunc1(char *name, func1Delegate func)
#else
void MyInterpreter::registerFunc1(char *name, int (*func)(int))
#endif
{
struct Function1 f;
f.len = strlen(name) + 1; // +1 for '('
f.name = (char *)malloc(f.len+1); // +1 for null
if (!f.name)
{
Serial.println("registerFunc1 alloc failed");
return;
}
memcpy(f.name, name, strlen(name));
f.name[f.len-1] = '(';
f.name[f.len] = 0;
f.func = func;
func1Handlers.add(f);
}
#ifdef USE_DELEGATES
void MyInterpreter::registerFunc2(char *name, func2Delegate func)
#else
void MyInterpreter::registerFunc2(char *name, int (*func)(int, int))
#endif
{
struct Function2 f;
f.len = strlen(name) + 1; // +1 for '('
f.name = (char *)malloc(f.len+1); // +1 for null
if (!f.name)
{
Serial.println("registerFunc1 alloc failed");
return;
}
memcpy(f.name, name, strlen(name));
f.name[f.len-1] = '(';
f.name[f.len] = 0;
f.func = func;
func2Handlers.add(f);
}
#ifdef USE_DELEGATES
void MyInterpreter::registerFunc3(char *name, func3Delegate func)
#else
void MyInterpreter::registerFunc3(char *name, int (*func)(int, int, int))
#endif
{
struct Function3 f;
f.len = strlen(name) + 1; // +1 for '('
f.name = (char *)malloc(f.len+1); // +1 for null
if (!f.name)
{
Serial.println("registerFunc1 alloc failed");
return;
}
memcpy(f.name, name, strlen(name));
f.name[f.len-1] = '(';
f.name[f.len] = 0;
f.func = func;
func3Handlers.add(f);
}
void MyInterpreter::setVariable(char variable, int value)
{
int idx;
if (variable >= 'a' && variable <= 'z')
idx = variable - 'a';
else if (variable >= 'A' && variable <= 'Z')
idx = variable - 'A';
else
return;
variables[idx] = value;
}
int MyInterpreter::stepRun()
{
return 0;
}
void MyInterpreter::printError(int err)
{
switch (err)
{
case ERROR_DIV0:
Serial.println("Divided by 0");
break;
case ERROR_SYNTAX:
Serial.println("Syntax error");
break;
case STOPPED:
Serial.println("Stopped");
break;
case ERROR_INTERNAL:
default:
Serial.println("Syntax error");
break;
}
}
int MyInterpreter::eval2(char *s, int len, int *val)
{
int i, l;
char *e;
int v, varn = -1, err;
//fwrite(s, 1, len, stderr);
//fprintf(stderr, "\n");
e = s + len;
// Skip space
while (*s != 0 && s<e && (*s == ' ' || *s == '\t' || *s == '\r' || *s == '\n'))
s ++;
if (*s == 0 || s == e) {
*val = 1;
return 0;
}
if (*s == '(') {
// ( で始まる場合
char *p;
int in = 1;
s ++;
while (*s != 0 && s<e && (*s == ' ' || *s == '\t'))
s ++;
if (*s == 0 || *s == ')')
return ERROR_SYNTAX;
p = s;
while (*s != 0 && s<e) {
if (*s == '(') {
in ++;
} else if (*s == ')') {
in --;
if (in == 0) {
s ++;
break;
}
}
s ++;
}
if (in > 0)
return ERROR_SYNTAX;
if ((err = eval2(p, s-p-1, &v)) != 0)
return err;
} else if ((*s == '!' && *(s+1) != '=') || *s == '~' || *s == '-' || *s == '+') {
// トークンが1項演算子の場合
char *p, op;
int in = 0;
op = *s;
s ++;
while (*s != 0 && s<e && (*s == ' ' || *s == '\t'))
s ++;
if (*s == 0 || s == e)
return ERROR_SYNTAX;
p = s;
while (*s != 0 && s<e && (in>0 || (*s != '+' && *s != '-' && *s != '>' && *s != '<' && *s != '='))) {
if (*s == '(') {
in ++;
} else if (*s == ')') {
in --;
}
s ++;
}
if (eval2(p, s-p, &v) != 0)
return ERROR_SYNTAX;
if (op == '!')
v = !v;
else if (op == '~')
v = ~v;
else if (op == '-')
v = -v;
} else if (*s>='0' && *s<='9') {
// トークンが数値の場合
if (*s == '0' && *(s+1) == 'x') {
v = 0;
s += 2;
while (*s != 0 && s<e && ((*s>='0' && *s<='9') ||
(*s>='a' && *s<='f') || (*s>='A' && *s<='F'))) {
if (*s>='0' && *s<='9')
v = (v<<4) + (*s - '0');
else if (*s>='a' && *s<='f')
v = (v<<4) + (*s - 'a' + 0xa);
else if (*s>='A' && *s<='F')
v = (v<<4) + (*s - 'A' + 0xa);
s ++;
}
} else if (*s == '0' && *(s+1) == 'b') {
v = 0;
s += 2;
while (*s != 0 && s<e && (*s>='0' && *s<='1')) {
v = (v<<1) + (*s - '0');
s ++;
}
} else {
v = 0;
while (*s != 0 && s<e && *s>='0' && *s<='9') {
v = v*10 + (*s - '0');
s ++;
}
}
} else if (((*s>='a' && *s<='z') || (*s>='A' && *s<='Z')) &&
(!(*(s+1)>='a' && *(s+1)<='z') && !(*(s+1)>='A' && *(s+1)<='Z'))) {
// The token is a varibale
if (*s>='a' && *s<='z')
varn = *s - 'a';
else
varn = *s - 'A';
v = variables[varn];
s ++;
} else {
// 定数かどうかをチェックする
for (i=0; i<CONST_NUM; i++) {
const struct ConstValue *c = constants+i;
if (e-s>=c->len && strncmp(c->name, s, 3) == 0) {
v = c->val;
s += c->len;
break;
}
}
// Check if the token is a supported function
// 引数が1つの関数
for (i=0; i<func1Handlers.count(); i++) {
const struct Function1 *f = &func1Handlers[i];
if (e-s>=f->len && strncmp(f->name, s, f->len) == 0) {
char *p;
int in = 1, v1;
s += f->len;
p = s;
while (*s != 0 && s<e && in>0) {
if (*s == '(') {
in ++;
} else if (*s == ')') {
in --;
}
s ++;
}
if (in>0)
return ERROR_SYNTAX;
if (eval2(p, s-p-1, &v1) != 0)
return ERROR_SYNTAX;
#ifdef USE_DELEGATES
v = f->func(v1);
#else
v = (*f->func)(v1);
#endif
}
}
// 引数が2つの関数
for (i=0; i<func2Handlers.count(); i++) {
const struct Function2 *f = &func2Handlers[i];
if (e-s>=f->len && strncmp(f->name, s, f->len) == 0) {
char *p;
int in = 0, v1, v2;
s += f->len;
p = s;
while (*s != 0 && s<e && !(in == 0 && *s == ',')) {
if (*s == '(')
in ++;
else if (*s == ')')
in --;
s ++;
}
if (*s != ',')
return ERROR_SYNTAX;
if (eval2(p, s-p, &v1) != 0)
return ERROR_SYNTAX;
s ++;
p = s;
in = 1;
while (*s != 0 && s<e && in>0) {
if (*s == '(')
in ++;
else if (*s == ')')
in --;
s ++;
}
if (in>0)
return ERROR_SYNTAX;
if (eval2(p, s-p-1, &v2) != 0)
return ERROR_SYNTAX;
#ifdef USE_DELEGATES
v = f->func(v1, v2);
#else
v = (*f->func)(v1, v2);
#endif
break;
}
}
// 引数が3つの関数
for (i=0; i<func3Handlers.count(); i++) {
const struct Function3 *f = &func3Handlers[i];
if (e-s>=f->len && strncmp(f->name, s, f->len) == 0) {
char *p;
int in = 0, v1, v2, v3;
s += f->len;
p = s;
while (*s != 0 && s<e && !(in == 0 && *s == ',')) {
if (*s == '(')
in ++;
else if (*s == ')')
in --;
s ++;
}
if (*s != ',')
return ERROR_SYNTAX;
if (eval2(p, s-p, &v1) != 0)
return ERROR_SYNTAX;
s ++;
p = s;
in = 0;
while (*s != 0 && s<e && !(in == 0 && *s == ',')) {
if (*s == '(')
in ++;
else if (*s == ')')
in --;
s ++;
}
if (*s != ',')
return ERROR_SYNTAX;
if (eval2(p, s-p-1, &v2) != 0)
return ERROR_SYNTAX;
s ++;
p = s;
in = 1;
while (*s != 0 && s<e && in>0) {
if (*s == '(')
in ++;
else if (*s == ')')
in --;
s ++;
}
if (in>0)
return ERROR_SYNTAX;
if (eval2(p, s-p-1, &v3) != 0)
return ERROR_SYNTAX;
#ifdef USE_DELEGATES
v = f->func(v1, v2, v3);
#else
v = (*f->func)(v1, v2, v3);
#endif
break;
}
}
}
// 次のトークンを確かめる
{
int v2;
// Skip space
while (*s != 0 && s<e && (*s == ' ' || *s == '\t'))
s ++;
if (*s == 0 || s == e) { // 後ろに演算子はなかった
*val = v;
return 0;
}
if (*s == '=' && *(s+1) != '=') {
char *p;
int op = *s, in = 0;
s ++;
while (*s != 0 && s<e && (*s == ' ' || *s == '\t'))
s ++;
if (*s == 0 || s == e)
return ERROR_SYNTAX;
p = s;
while (*s != 0 && s<e && (in>0 ||
!(*s == '=' && *(s+1) == '='))) {
if (*s == '(') {
in ++;
} else if (*s == ')') {
in --;
}
s ++;
}
if ((err = eval2(p, s-p, &v2)) != 0)
return err;
if (varn < 0 || varn>=sizeof(variables))
return ERROR_INTERNAL;
v = variables[varn] = v2;
if (*s == 0 || s == e) {
*val = v;
return 0;
}
}
while (*s == '*' || *s == '/' || *s == '%') {
char *p;
int op = *s, in = 0;
s ++;
while (*s != 0 && s<e && (*s == ' ' || *s == '\t'))
s ++;
if (*s == 0 || s == e)
return ERROR_SYNTAX;
p = s;
while (*s != 0 && s<e && (in>0 ||
(*s != '*' && *s != '/' && *s != '%' &&
*s != '+' && *s != '-' && *s != '>' && *s != '<' &&
!(*s == '=' && *(s+1) == '=') && *s != '!'))) {
if (*s == '(') {
in ++;
} else if (*s == ')') {
in --;
}
s ++;
}
if ((err = eval2(p, s-p, &v2)) != 0)
return err;
switch (op) {
case '*':
v = v*v2;
break;
case '/':
v = v/v2;
break;
case '%':
v = v%v2;
break;
}
if (*s == 0 || s == e) {
*val = v;
return 0;
}
}
if (*s == '+' || *s == '-') {
char *p;
int op = *s, in = 0;
p = s;
while (*s != 0 && s<e && (in>0 || (*s != '>' && *s != '<' && *s != '=' && *s != '!'))) {
if (*s == '(') {
in ++;
} else if (*s == ')') {
in --;
}
s ++;
}
if (in != 0)
return ERROR_SYNTAX;
// 演算子の右側を計算する
if ((err = eval2(p, s-p, &v2)) != 0)
return err;
// 左と右を足す
v = v + v2;
if (*s == 0 || s==e) {
*val = v;
return 0;
}
}
if (*s == '>' || *s == '<' || (*s == '=' && *(s+1) == '=')
|| (*s == '!' && *(s+1) == '=')) {
char *p;
int op = *s, op2 = *(s+1), in = 0;
s ++;
if (op2 == '=' || op2 == '<' || op2 == '>')
s ++;
p = s;
while (*s != 0 && s<e && (in>0 || (*s != '&' && *s != '^' && *s != '|'))) {
if (*s == '(') {
in ++;
} else if (*s == ')') {
in --;
}
s ++;
}
if (in != 0)
return ERROR_SYNTAX;
// 演算子の右側を計算する
if ((err = eval2(p, s-p, &v2)) != 0)
return err;
if (op == '>') {
if (op2 == '=') {
v = v>=v2;
} else if (op2 == '>') {
v = v>>v2;
} else {
v = v>v2;
}
} else if (op == '<') {
if (op2 == '=') {
v = v<=v2;
} else if (op2 == '<') {
v = v<<v2;
} else {
v = v<v2;
}
} else if (op == '=' && op2 == '=') {
v = (v == v2);
} else if (op == '!' && op2 == '=') {
v = (v != v2);
}
if (*s == 0 || s==e) {
*val = v;
return 0;
}
}
if ((*s == '&' && *(s+1) != '&') || (*s == '|' && *(s+1) != '|') ||
*s == '^') {
char *p;
int op = *s, in = 0;
s ++;
p = s;
while (*s != 0 && s<e && (in>0 || !((*s == '&' && *(s+1) == '&') ||
(*s == '|' && *(s+1) == '|')))) {
if (*s == '(') {
in ++;
} else if (*s == ')') {
in --;
}
s ++;
}
if (in != 0)
return ERROR_SYNTAX;
// 演算子の右側を計算する
if ((err = eval2(p, s-p, &v2)) != 0)
return err;
if (op == '&')
v = v & v2;
else if (op == '|')
v = v | v2;
else if (op == '^')
v = v ^ v2;
if (*s == 0 || s==e) {
*val = v;
return 0;
}
}
if ((*s == '&' && *(s+1) == '&') || (*s == '|' && *(s+1) == '|')) {
int op = *s;
s += 2;
// 演算子の右側を計算する
if ((err = eval2(s, e-s, &v2)) != 0)
return err;
if (op == '&')
v = v && v2;
else if (op == '|')
v = v || v2;
*val = v;
return 0;
}
}
error:
return ERROR_INTERNAL;
}
char *MyInterpreter::skipSpace(char *s, char *e)
{
while (*s != 0 && s<e && (*s == ' ' || *s == '\t' || *s == '\r' || *s == '\n'))
s ++;
return s;
}
int MyInterpreter::run(char *prg, int len)
{
char *cur, *s, *e;
int err, in, v, skip;
s = prg;
e = prg + len;
for (;;) {
char *p, *start;
start = s = skipSpace(s, e);
if (*s == 0 || s>=e)
break;
WDT.alive();
skip = 0;
// fprintf(stderr, s);
if ((strncmp(s, "continue", 8) == 0
&& (*(s+8) == ';' ||
*(s+8) == ' ' || *(s+8) == '\t' ||
*(s+8) == '\r' || *(s+8) == '\n')) ||
(strncmp(s, "break", 5) == 0
&& (*(s+5) == ';' ||
*(s+5) == ' ' || *(s+5) == '\t' ||
*(s+5) == '\r' || *(s+5) == '\n'))) {
char *cond, *cond_e, *p1, *statement, *statement_e;
char *statement2 = NULL, *statement2_e;
int continue_break = 0;
p1 = s;
if (strncmp(s, "continue",8) == 0) {
continue_break = 1;
s += 8;
} else {
s += 5;
}
s = skipSpace(s, e);
if (*s != ';') {
writeS(p1, 20);
return ERROR_SYNTAX;
}
s ++;
if (continue_break == 0)
return FOUND_BREAK;
return FOUND_CONTINUE;
} else if ((strncmp(s, "while", 5) == 0
&& (*(s+5) == '(' ||
*(s+5) == ' ' || *(s+5) == '\t' ||
*(s+5) == '\r' || *(s+5) == '\n')) ||
(strncmp(s, "if", 2) == 0
&& (*(s+2) == '(' ||
*(s+2) == ' ' || *(s+2) == '\t' ||
*(s+2) == '\r' || *(s+2) == '\n'))) {
char *cond, *cond_e, *p1, *statement, *statement_e;
char *statement2 = NULL, *statement2_e;
int while_if = 0;
if (strncmp(s, "while", 5) == 0) {
while_if = 1;
s += 5;
} else
s += 2;
p1 = s;
s = skipSpace(s, e);
if (*s != '(') {
writeS(p1, 20);
return ERROR_SYNTAX;
}
s ++;
cond = s;
in = 1;
while (*s !=0 && s<e && (in>0 || *s != ')')) {
if (*s == '(')
in ++;
if (*s == ')') {
in --;
if (in == 0)
break;
}
s ++;
}
if (*s != ')') {
writeS(p1, s-p1);
return ERROR_SYNTAX;
}
cond_e = s;
s ++;
s = skipSpace(s, e);
if (*s == 0 || s>=e) {
writeS(p1, s-p1);
return ERROR_SYNTAX;
}
statement = s;
in = 0;
while (*s !=0 && s<e && (in>0 || (*s != '}' && *s != ';'))) {
if (*s == '{')
in ++;
else if (*s == '}') {
in --;
if (in == 0)
break;
}
s ++;
}
if (*s == 0 || s>=e || (*s != ';' && *s != '}') || in > 0) {
writeS(p1, s-p1);
return ERROR_SYNTAX;
}
s ++;
statement_e = s;
// 必要なら else 部分を取り出す
s = skipSpace(s, e);
// fprintf(stderr, "*1 %s\n", s);
if (while_if == 0 && strncmp(s, "else", 4) == 0
&& (*(s+4) == '{' ||
*(s+4) == ' ' || *(s+4) == '\t' ||
*(s+4) == '\r' || *(s+4) == '\n')) {
s += 4;
s = skipSpace(s, e);
if (*s == 0 || s>=e) {
writeS(p1, s-p1);
return ERROR_SYNTAX;
}
//fprintf(stderr, "*2 %s\n", s);
statement2 = s;
in = 0;
while (*s !=0 && s<e && (in>0 || (*s != '}' && *s != ';'))) {
if (*s == '{')
in ++;
else if (*s == '}') {
in --;
if (in == 0)
break;
}
s ++;
}
if (*s == 0 || s>=e || (*s != ';' && *s != '}') || in > 0) {
writeS(p1, s-p1);
return ERROR_SYNTAX;
}
statement2_e = s;
}
if (while_if>0) {
// while 文の処理
if (!reportProgPos && (runAnimate || runStep)) {
Serial.print("while (");
writeS(cond, cond_e-cond);
Serial.print(")\n");
}
if (!reportProgPos && (err = stepRun()) != 0)
return err;
for (;;) {
err = eval2(cond, cond_e-cond, &v);
if (err)
return err;
if (!reportProgPos && (runAnimate || runStep)) {
writeS(cond, cond_e-cond);
Serial.print(": ");
Serial.print(v ? "true" : "false");
Serial.println("");
}
//fwrite(cond, 1, cond_e-cond, stderr);
//fprintf(stderr, ": %d\n", v);
if (v == 0)
break;
if (!reportProgPos && (runAnimate || runStep)) {
if (err = stepRun() != 0)
return err;
}
err = run(statement, statement_e-statement);
if (err == FOUND_CONTINUE)
continue;
else if (err == FOUND_BREAK)
break;
else if (err)
return err;
}
} else {
// if 文の処理
if (!reportProgPos && (runAnimate || runStep)) {
Serial.print("if (");
writeS(cond, cond_e-cond);
Serial.print(")");
}
err = eval2(cond, cond_e-cond, &v);
if (err) {
if (!reportProgPos && (runAnimate || runStep))
Serial.println("");
return err;
}
if (!reportProgPos && (runAnimate || runStep)) {
Serial.print(": ");
Serial.print(v ? "true" : "false");
Serial.println("");
}
//fwrite(cond, 1, cond_e-cond, stderr);
//fprintf(stderr, ": %d\n", v);
if (v != 0) {
err = run(statement, statement_e-statement);
if (err)
return err;
} else {
if (statement2 != NULL) {
err = run(statement2, statement2_e-statement2);
if (err)
return err;
}
}
}
} else if ((strncmp(s, "for", 3) == 0
&& (*(s+3) == '(' ||
*(s+3) == ' ' || *(s+3) == '\t' ||
*(s+3) == '\r' || *(s+3) == '\n'))) {
char *init, *init_e;
char *cond, *cond_e, *inc, *inc_e;
char *statement, *statement_e, *p1;
p1 = s;
s += 3;
s = skipSpace(s, e);
if (*s != '(') {
writeS(p1, 20);
return ERROR_SYNTAX;
}
s ++;
s = skipSpace(s, e);
init = s;
while (*s !=0 && s<e && *s != ';')
s ++;
if (*s == 0 || s>=e) {
writeS(p1, 20);
return ERROR_SYNTAX;
}
init_e = s;
s ++;
s = skipSpace(s, e);
cond = s;
while (*s !=0 && s<e && *s != ';')
s ++;
if (*s == 0 || s>=e) {
writeS(p1, s-p1);
return ERROR_SYNTAX;
}
cond_e = s;
s ++;
inc = s = skipSpace(s, e);
in = 1;
while (*s !=0 && s<e && (in>0 || *s != ')')) {
if (*s == '(')
in ++;
else if (*s == ')') {
in --;
if (in == 0)
break;
}
s ++;
}
if (*s == 0 || s>=e) {
writeS(p1, s-p1);
return ERROR_SYNTAX;
}
inc_e = s;
s ++;
s = skipSpace(s, e);
statement = s;
in = 0;
while (*s !=0 && s<e && (in>0 || (*s != '}' && *s != ';'))) {
if (*s == '{')
in ++;
else if (*s == '}') {
in --;
if (in == 0)
break;
}
s ++;
}
if (*s == 0 || s>=e || (*s != ';' && *s != '}') || in > 0) {
writeS(p1, s-p1);
return ERROR_SYNTAX;
}
s ++;
statement_e = s;
// for 文の処理
if (runAnimate || runStep) {
Serial.print("for (");
writeS(init, init_e-init);
Serial.print("; ");
writeS(cond, cond_e-cond);
Serial.print("; ");
writeS(inc, inc_e-inc);
Serial.print(")\n");
}
if (!reportProgPos && (runAnimate || runStep)) {
if ((err = stepRun()) != 0)
return err;
writeS(init, init_e-init);
Serial.println("");
}
if ((err = eval2(init, init_e-init, &v)) != 0) {
return err;
}
if (!reportProgPos && (runAnimate || runStep))
if(err = stepRun() != 0)
return err;
for (;;) {
if ((err = eval2(cond, cond_e-cond, &v)) != 0)
return err;
if (!reportProgPos && (runAnimate || runStep)) {
writeS(cond, cond_e-cond);
Serial.print(": ");
Serial.print(v ? "true" : "false");
Serial.println("");
}
if (v == 0)
break;
//fwrite(statement, 1, statement_e-statement, stderr);
if ((err = run(statement, statement_e-statement)) != 0) {
if (err == FOUND_CONTINUE)
; /* DO_NOTHING */
else if (err == FOUND_BREAK)
break;
else return err;
}
if (!reportProgPos && (runAnimate || runStep)) {
writeS(inc, inc_e-inc);
Serial.println("");
}
if ((err = eval2(inc, inc_e-inc, &v)) != 0)
return err;
if (runAnimate || runStep) {
if ((err = stepRun()) != 0)
return err;
}
}
} else if (*s == '{' || *s == '}') {
s ++;
skip = 1;
} else { // 式文の処理
p = s;
in = 0;
while (*s != 0 && s<e && (in>0 || *s != ';'))
s ++;
if (*s == 0 && in>0) {
writeS(p, s-p);
return ERROR_SYNTAX;
}
if (s != p) {
if (!reportProgPos && (runAnimate != 0 || runStep)) {
writeS(p, s-p);
Serial.println("");
}
if ((err = eval2(p, s-p, &v)) != 0) {
writeS(p, s-p);
Serial.println("");
return err;
}
} else
skip = 1;
s ++;
#if 0
printf("%d\n", v);
#endif
if (skip == 0) {
if ((err = stepRun()) != 0)